You can construct a set of bicycle panniers in under an hour using two kitty litter buckets,…
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Instructables user bonedoggie needed a basket to transport vegetables and used ¾" PVC pipe to build a frame to hold the milk crate. His bike had an unused hole drilled by his rear axle so he drilled holes in the PVC to attach and built up a frame to hold the milk crate. This seems to be a great way to add cargo room to a bike on a budget.